A loud, large-scale Diapason,
nearly always of 8' pitch, invented by Robert Hope-Jones.
While Audsley claims that it is constructed in the same was as a normal
Diapason, most other sources describe it as having leathered upper lips.
Irwin describes the upper lip as having a roll of pipe metal, serving
the same purpose as leathering, but being more durable.
This treatment, according to Irwin, “gives it a pervasive, dull, round
tone that is unfit for use as a base-tone for any type of Diapason Chorus.”
He describes it as a solo voice, unfit for hymns or polyphonic music.
Maclean describes its tone as “rich, full, and strongly foundational”,
and says that it “blends well with other stops of similar pitch and
character, but failed to combine effectively with upper octave and
mutation ranks”.